Polydiallyldimethylammonium chloride (PolyDADMAC or PDADMAC) is a highly effective cationic polymer widely used in water treatment, papermaking, and industrial wastewater applications due to its strong charge density and excellent flocculation capabilities. The AQ series—specifically AQ 220-P, AQ 223-P, AQ 234-P, and AQ 235-P—represents high-quality PDADMAC products formulated for specific flocculation, dewatering, and purification processes. Their applications vary slightly depending on molecular weight, charge density, and viscosity, but they all share the fundamental property of cationic polymerization that allows them to neutralize negatively charged particles, promote aggregation, and enhance solid-liquid separation.

AQ 220-P is a medium molecular weight cationic polydadmac widely used in municipal and industrial water treatment. In drinking water purification, AQ 220-P acts as a primary coagulant aid. Negatively charged colloidal particles, such as clay, silt, and natural organic matter (NOM), resist settling due to electrostatic repulsion. AQ 220-P neutralizes these charges, enabling particles to aggregate into larger flocs that can be efficiently removed via sedimentation and filtration. This application improves turbidity reduction and reduces the demand for conventional coagulants such as alum and ferric salts. In industrial wastewater treatment, AQ 220-P is employed in the clarification of effluents from textile, paper, and chemical industries. Its cationic nature effectively captures anionic contaminants, suspended solids, and emulsified oils, enhancing sludge dewatering performance in subsequent filtration or centrifugation steps. Additionally, AQ 220-P is sometimes used in sludge conditioning to improve cake dryness in mechanical dewatering processes such as belt presses and filter presses.

AQ 223-P is a higher molecular weight PDADMAC designed for enhanced floc strength and rapid settling. Its primary application lies in industrial water treatment, particularly in systems with high suspended solids content or where rapid clarification is critical. In pulp and paper mills, AQ 223-P serves as a retention and drainage aid, promoting fiber-filler retention during sheet formation while reducing water content in the white water loop. The polymer’s high molecular weight promotes bridging between particles, improving floc size and integrity. In municipal wastewater treatment, AQ 223-P is used to accelerate primary and secondary sedimentation, reducing hydraulic retention times and enhancing sludge thickening. Its robust cationic nature also allows it to function as a coagulant in effluents with high color or dissolved organic content, facilitating the removal of humic substances and other anionic organic compounds.

AQ 234-P is formulated for high-efficiency sludge dewatering and conditioning applications. Its medium-to-high charge density makes it particularly effective in treating secondary and digested sludges in municipal and industrial wastewater plants. When added to sludge, AQ 234-P neutralizes negative charges on floc surfaces and promotes aggregation into dense, filterable flocs. This improves the performance of centrifuges, belt presses, and vacuum filters, yielding a drier sludge cake and reducing disposal costs. In the paper industry, AQ 234-P is also used as a wet-end additive for controlling pitch, fines, and colloidal retention. The polymer enhances drainage, reduces sheet formation defects, and contributes to improved machine runnability. Additionally, AQ 234-P finds application in chemical and food processing effluents, where it aids in the removal of suspended solids, emulsified oils, and other colloidal matter.

AQ 235-P represents a premium, high molecular weight PDADMAC optimized for demanding clarification and dewatering tasks. Its application is particularly important in challenging industrial effluents such as those from chemical, pharmaceutical, and mineral processing plants. In alumina and mining operations, AQ 235-P assists in red mud settling and tailings thickening, where conventional coagulants may be insufficient. Its strong bridging and charge neutralization capability accelerates floc formation, reduces residual turbidity, and minimizes water recycling challenges. In wastewater treatment plants handling industrial or municipal effluents with high organic load, AQ 235-P significantly enhances sludge dewatering, producing dense and stable sludge cakes. Furthermore, it can be employed in combination with other flocculants, such as anionic polyacrylamides, to optimize conditioning and dewatering performance.

In summary, AQ 220-P, AQ 223-P, AQ 234-P, and AQ 235-P are cationic polydadmac polymers tailored for specific water and wastewater treatment, industrial effluent clarification, and sludge dewatering applications. AQ 220-P focuses on general coagulation and colloid destabilization in water treatment; AQ 223-P targets high suspended solids systems and retention in papermaking; AQ 234-P emphasizes sludge conditioning and wet-end paper applications; and AQ 235-P delivers high-performance flocculation for challenging effluents and thickening operations. Across all applications, these polymers provide improved floc formation, enhanced solid-liquid separation, reduced chemical consumption, and better overall process efficiency, making them indispensable tools in modern water management and industrial treatment operations.